// Objet XMLHttpRequest
var http; 
 
function createRequestObject()
{
    var http;
    if (window.XMLHttpRequest)
    { 
    	// Mozilla, Safari, IE7 ...
        http = new XMLHttpRequest();
    }
    else if (window.ActiveXObject)
    {
    	// Internet Explorer 6
        http = new ActiveXObject("Microsoft.XMLHTTP");
    }
    return http;
}